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1.3
Switch Inputs
E cept for variants with suffix -S, two push-button switches are provided for calibrating the
compass in the field.
When the FG is 1 viewed from the front face with the LED facing, then Switch 1 is on the right
and Switch 2 is on the left.
1
Switch 1:
2
Switch 2:
upright but at any azimuth. Pressing S2 sets the heading to zero and so can be done
when the whole installation is headed North.
3
Both together
calibration process to halt and restores the previously saved calibration values.
1.4 Indicator light
A blue light indicates three states of the FG1.
State 1
Uncalibrated
State 2
In the process of calibration
State 3
Calibrated
After the reset command,
will have a long flash.
Note that the LED can be turned off and on by the DLED command – see section 5.
S2
Fig 1
Start the auto-calibration process
Set reference NORTH heading. The FG1 must be mounted
Pressing both together for at least one second causes the auto-
$PATC,IIHDG,0CV<CR><LF>
4 of 12
S1
long flash
continuous
short flash
, the FG1 is uncalibrated and
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